EP0031182B1 - Verstärkeranordnung mit parallel angesteuerten Verstärkerabschnitten - Google Patents

Verstärkeranordnung mit parallel angesteuerten Verstärkerabschnitten Download PDF

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Publication number
EP0031182B1
EP0031182B1 EP80201182A EP80201182A EP0031182B1 EP 0031182 B1 EP0031182 B1 EP 0031182B1 EP 80201182 A EP80201182 A EP 80201182A EP 80201182 A EP80201182 A EP 80201182A EP 0031182 B1 EP0031182 B1 EP 0031182B1
Authority
EP
European Patent Office
Prior art keywords
amplifier
input
amplifier section
voltage
sections
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP80201182A
Other languages
English (en)
French (fr)
Other versions
EP0031182A1 (de
Inventor
Nico Valentinus Franssen
Theodorus Jozef Van Kessel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of EP0031182A1 publication Critical patent/EP0031182A1/de
Application granted granted Critical
Publication of EP0031182B1 publication Critical patent/EP0031182B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/211—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3223—Modifications of amplifiers to reduce non-linear distortion using feed-forward
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics

Definitions

  • the invention relates to an amplifier arrangement whose signal input is coupled to the inputs of n amplifier sections, whose outputs are connected single-ended to a common output circuit, through which the output signal currents of the amplifier sections are passed in the same phase, whilst between the output of each amplifier section and the common output circuit there is included a resistor, that each amplifier section comprises a difference element with a first and a second input, and an output for supplying a corresponding compensation signal, the first Input of the difference element being coupled to the input of the corresponding amplifier section, and that for each amplifier section the corresponding compensation signal is applied to the input of another amplifier section.
  • An amplifier arrangement of this type is described in GB-A-2 010039 which has been laid open for public inspection, see especially Fig. 2 of the said application.
  • a voltage signal is measured across the corresponding resistor.
  • This voltage signal together with the input voltage of this amplifier section, is applied to inputs of the corresponding difference element.
  • the compensation signal supplied by the difference element of the one amplifier section is applied to the input of the other amplifier section and vice versa.
  • the known arrangement exhibits a distortion which is sometimes still too high.
  • the arrangement according to the invention is characterized in that, for each amplifier section a compensation voltage is derived which depends on the sum of the voltage across the output circuit and the voltage across the corresponding resistor, that the sum voltage so derived for the k th- amplifier section is applied to the second input of the corresponding difference element and that the corresponding compensation signal from the k th- amplifier section is applied to the input of the (k+1 ) t "_ amplifier section (k ranging from 1 to n, the number n+1 representing the first amplifier section and n being at least 2).
  • the invention is based on the one hand on the recognition that one can obtain an amplifier arrangement in which the amount of distortion suppression is less dependent on the exact settings of the relevant parameters. This could be obtained by deriving for each amplifier section a voltage signal which depends on the voltage across the output circuit and that across the corresponding resistor. In this way negative feedback could be introduced in the arrangement according to the invention, whilst the known arrangement in which the voltage is derived across the corresponding resistor only is based on the feed-forward principle, which is generally referred to as the "addition of what is missing" principle known inter alia from the book “Precision Electronics” by Klein and Zaalberg van Zelst, Centrex, Eindhoven 1967, page 164 et seq.
  • DE-A-27 50 974 also describes two or more amplifier sections connected in parallel to drive an output circuit. However, it does not mention the specific measure by means of which a compensation signal is obtained, nor does it mention the specific interconnections between the outputs of the various difference elements of the corresponding amplifier sections and the inputs of successive amplifier sections.
  • a preferred embodiment of the amplifier arrangement according to the invention employing amplifier sections with a low internal output impedance, is characterized in that negative voltage feedback is applied between the common output circuit and the input of the amplifier arrangement.
  • negative voltage feedback is applied between the common output circuit and the input of the amplifier arrangement.
  • the signal from a source 10 is applied to a load 11 to be included or included in a common output circuit via parallel operated amplifier sections 1, 2 and 3. It is to be understood, that, at option, more amplifier sections may be connected in parallel, as indicated by the dashed connecting lines in Fig. 1. These amplifier sections may be constituted by separate operational amplifiers, for example of the emitter-follower type with a low output impedance, but may also be integrated together on one semiconductor body. Between the output of amplifier sections 1, 2, 3 and the common load resistance 11 are respective resistors 4, 5 and 6 included.
  • the output voltage of the amplifier section 1, after being attenuated in an attenuator 7, is applied to an input of a difference element 14.
  • the input signal of amplifier section 1 is applied to another input of difference element 14.
  • the attenuation factor of the attenuator 7 is adjusted so that the signal amplitudes at the input of the difference element 14 are substantially equal i.e. the attenuation factor is equal to the reciprocal of the gain factor of the amplifier section 1.
  • this difference element will in principle only form the distortion components (error signals) between the output and the input signal of the amplifier section 1.
  • the gain factors of the amplifier sections 1 and 2 are assumed to be equal, this will provide full compensation for the distortion components supplied to the load impedance 11 by the amplifier section 1.
  • the output voltage of the amplifier section 2 after being attentuated in an attenuator 8, is applied to an input of a difference element 15 and the input signal of amplifier section 2 is applied to another input of difference element 15.
  • the output signal of difference element 15 is added to the signal from the source 10 in a summator 15 and is subsequently applied to the amplifier section 3 etc.
  • the output voltage of amplifier 1 equals the voltage across the resistor 4 plus the voltage across output circuit 11.
  • This voltage which is attenuated in attentuator 7 and applied to an input of difference element 14, partly functions as a negative feedback voltage. This because of the fact that via the elements 7, 14, 18, 2 and 5 this voltage influences the voltage at the common point between the resistors 4, 5, 6 and the output circuit resistor 4 and hence influences the voltage at the output of amplifier section 1.
  • the same reasoning is of course valid for the voltages derived at the outputs of amplifiers 2 and 3.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Amplifiers (AREA)

Claims (2)

1. Verstärkeranordnung, deren Signaleingang met den Eingängen von n Verstärkerabschnitten (1, 2, 3) verbunden ist, deren Ausgänge einseitig an eine gemeinsame Ausgangsschattung (11) angeschlossen sind, die die Ausgangssignalströme der Verstärkerabschnitte gleichphasig durchfliessen, wobei zwischen dem Ausgang eines jeden Verstärkerabschnitts un der gemeinsamen Ausgangsschaltung (11) ein Widerstand (4, 5, 6) aufgenommen ist und jedem Verstärkerabschnitt (1, 2, 3) ein DIfferenzelement (14, 15, 16) mit einem ersten (+) und einem zweiten (-) Eingang sowie einem Ausgang zur Lieferung eines entsprechenden Ausgleichssignals zugeordnet ist, und wobei der erste Eingang (+) des Differenzelements an den Eingang des entsprechenden Verstärkerabschnitts (1, 2, 3) angeschlossen ist und dass das entsprechende Ausgleichsignal eines jeden Verstärkerabschnitts (1, 2, 3) an den Eingang eines anderen Verstärkerabschnitts (1, 2, 3) gelangt, dadurch gekennzeichnet, dass für jeden Verstärkerabschnitt (1, 2, 3) eine Ausgleichsspannung abgeleitet wird, die von der Summe der Spannung an der Ausgangsschaltung (11) und der Spannung am entsprechenden Widerstand (4, 5, 6) abhängig ist, dass die für den k. Verstärkerabschnitt (1, 2, 3) so abgeleitete Summenspannung an den zweiten Eingang (-) des entsprechenden Differenzelements (14, 15, 16) und das entsprechende Ausgleichssignal aus dem k. Verstärkerabschnitt (1, 2, 3) an den Eingang des (k + 1). Verstärkerabschnitt (1, 2, 3) gelangt (der Wert für k liegt zwischen 1 und n, wobei die Zahl n + 1 den ersten Verstärkerabschnitt darsteflt und n mindestens 2 beträgt).
2. Verstärkeranordnung nach Anspruch 1 mit Verstärkerabschnitten mit einer niedrigen inneren Ausgangsimpedanz, dadurch gekennzeichnet, dass eine negative Spannungsrückkopplung zwischen der gemeinsamen Ausgangsschaltung (11) und dem Eingang der Verstärkeranordnung erfolgt.
EP80201182A 1979-12-19 1980-12-09 Verstärkeranordnung mit parallel angesteuerten Verstärkerabschnitten Expired EP0031182B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL7909126 1979-12-19
NL7909126A NL7909126A (nl) 1979-12-19 1979-12-19 Versterkerinrichting met parallelwerkende deelversterker.

Publications (2)

Publication Number Publication Date
EP0031182A1 EP0031182A1 (de) 1981-07-01
EP0031182B1 true EP0031182B1 (de) 1983-07-20

Family

ID=19834339

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80201182A Expired EP0031182B1 (de) 1979-12-19 1980-12-09 Verstärkeranordnung mit parallel angesteuerten Verstärkerabschnitten

Country Status (7)

Country Link
US (1) US4480229A (de)
EP (1) EP0031182B1 (de)
JP (1) JPS5694808A (de)
AU (1) AU536889B2 (de)
CA (1) CA1146640A (de)
DE (1) DE3064333D1 (de)
NL (1) NL7909126A (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3220252C2 (de) * 1982-05-28 1985-09-12 Siemens AG, 1000 Berlin und 8000 München Verfahren zur Beseitigung von Verzerrungen in Verstärkern
US4683441A (en) * 1985-11-19 1987-07-28 Siemens Aktiengesellschaft Apparatus for establishing the differences between multiple pairs of analog input signals
GB2238684B (en) * 1989-10-11 1994-08-17 Aubrey Max Sandman A modern amplifier system
JPH05122159A (ja) * 1991-05-13 1993-05-18 Internatl Business Mach Corp <Ibm> 伝送信号の信号対雑音比の改良方法及び光学的相互接続システム
GB2279528A (en) * 1993-06-25 1995-01-04 Gary Miller Current amplifier circuits
US5399986A (en) * 1993-12-20 1995-03-21 Yen; Wailit Isolated multi-output power amplifier
UA72936C2 (en) * 2002-04-24 2005-05-16 Oleksandr Oleksiiovych Borysov Method for compensating signal distortions caused by an amplifier

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1487688A (en) * 1974-02-16 1977-10-05 Licentia Gmbh Redundant electronic amplifier circuit
GB2010039A (en) * 1977-12-07 1979-06-20 Philips Nv Amplifier circuit arrangement

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5291632A (en) * 1976-01-29 1977-08-02 Toshiba Corp Amplifier
US4081757A (en) * 1976-11-19 1978-03-28 Altec Corporation Parallel power amplifier circuits

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1487688A (en) * 1974-02-16 1977-10-05 Licentia Gmbh Redundant electronic amplifier circuit
GB2010039A (en) * 1977-12-07 1979-06-20 Philips Nv Amplifier circuit arrangement

Also Published As

Publication number Publication date
EP0031182A1 (de) 1981-07-01
AU6544480A (en) 1981-06-25
NL7909126A (nl) 1981-07-16
US4480229A (en) 1984-10-30
DE3064333D1 (en) 1983-08-25
AU536889B2 (en) 1984-05-31
JPS5694808A (en) 1981-07-31
CA1146640A (en) 1983-05-17
JPS642285B2 (de) 1989-01-17

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